Automatic sand abrasion device

ABSTRACT

An automatic sand abrasion device includes a shell, an integrated framework, a sand falling mechanism, a sand transport mechanism, a sand falling channel, a sample working frame and a circuit control cabinet, where the device adopts the transport belt and the second speed reduction motor to realize transportation of sand, and realizes that the weighed sand falls into the bottom of the abrasion device through the first speed reduction motor and the automatic weighing machine. The whole process can be automatically operated while parameters such as the operation time and the weight of abrasion sand are set, so that the detection efficiency for the abrasion resistance can be improved, and the labor cost is greatly reduced. The device is firm in structure and stable and reliable in work and improves the accuracy and efficiency of an experiment.

CROSS REFERENCE TO RELATED APPLICATION

This application claims priority to Chinese Patent Application No. 201910034694.3, entitled AUTOMATIC SAND ABRASION DEVICE and filed on Jan. 15, 2019, which is incorporated herein by reference for all purposes.

FIELD OF THE INVENTION

The present disclosure relates to the technical field of verification of sand abrasion resistance of coated surface paints, and more particularly relates to an automatic sand abrasion device.

BACKGROUND OF THE INVENTION

With the upgrading of automobile consumption, people pay more and more attention to the appearance of automobiles, and the more beautiful the appearance of an automobile is, the more popular the automobile is. The quality of a paint is directly related to whether the appearance of the automobile is accepted by the public. Therefore, automobile manufacturers pay special attention to the various properties of the paint. The abrasion resistance of the paint is directly related to whether the appearance of the automobile will be easily scratched during use.

At present, detection of the abrasion resistance of the paint is still at the stage of manually carrying sand to a certain position little by little and then causing the sand to impact the surface of a paint film. This measure not only consumes a lot of manpower and material resources, but also has a great impact on human health since tiny dust may suffuse in air during the impacting. In addition, such measure is relatively low in detection capacity and accuracy and is very low in efficiency.

SUMMARY OF THE INVENTION

The embodiment of the present disclosure provides an automatic sand abrasion device, which can improve the detection efficiency for the abrasion resistance of a paint, greatly reduces the labor cost and improves the accuracy and efficiency of the experiment.

In order to achieve the above objective, the present disclosure provides the following technical solution:

An automatic sand abrasion device, which is characterized by including a shell, an integrated framework, a sand falling mechanism, a sand transport mechanism, a sand falling channel, a sample working frame and a circuit control cabinet. The integrated framework includes an experiment table supporting frame, supporting rods and a weighing machine bracket. The weighing machine bracket is fixedly mounted at the bottom in the experiment table supporting frame. The supporting rods are fixedly disposed in the experiment table supporting frame to allow the integrated framework to be firmer. The shell is welded on the experiment table supporting frame, and the integrated framework, the sand falling mechanism, the sand transport mechanism, the sand falling channel and the sample working frame are all located in the shell. The circuit control cabinet is located outside the shell. The sand falling mechanism is used for allowing sand on an automatic weighing machine to fall into the bottom of the automatic sand abrasion device, and includes a guide rail slot, the automatic weighing machine, a first speed reduction motor and a rectangular toothed rack frame. The guide rail slot is fixed on the weighing machine bracket. The rectangular toothed rack frame is disposed on two sides of the inner side of the guide rail slot. A toothed rack is disposed on the rectangular toothed rack frame. The automatic weighing machine and the rectangular toothed rack frame are fixedly connected. A gear of the first speed reduction motor is mounted in the rectangular toothed rack frame and meshes with the toothed rack of the rectangular toothed rack frame, so that the gear of the first speed reduction motor can drive the automatic weighing machine through the rectangular toothed rack frame to do a horizontal back and forth motion along the guide rail slot. The sand transport mechanism includes a second speed reduction motor, a transport belt wheel, a transport belt and guide rollers. The second speed reduction motor is fixed at the exterior top of the experiment table supporting frame. The guide rollers are fixed along a moving track of the transport belt. An output shaft of the second speed reduction motor is connected with the transport belt wheel. The transport belt is disposed on the transport belt wheel. The second speed reduction motor drives the transport belt wheel to rotate. The transport belt wheel rotates to drive the transport belt to operate along a rail regulated by the guide rollers. Experimental sand is poured into the bottom of the sand abrasion device to submerge the bottom of the transport belt. The sand falling channel is located at a middle position of a region encircled by the transport belt, and includes an upper funnel, a falling pipe and a sand collection inverted bucket. The upper end of the falling pipe is provided with the upper funnel, and the lower end of the falling pipe is provided with the sand collection inverted bucket. The falling pipe and the sand collection inverted bucket are fixedly mounted on the experiment table supporting frame. A door is disposed on the sand collection inverted bucket and can be opened to place an experiment object. The lower end of the sand collection inverted bucket is in contact with the upper surface of the automatic weighing machine. The area of the upper surface of the automatic weighing machine is larger than that of an opening at the lower end of the sand collection inverted bucket. The sample working frame includes an experiment object frame, an object frame supporting rod and object fixing bolts. The experiment object frame is located in the sand collection inverted bucket. The object frame supporting rod passes through the sand collection inverted bucket to fix the experiment object frame on the experiment table supporting frame. The object fixing bolts are used for fixing the experiment object and adjusting the position of the experiment object on the experiment object frame. The circuit control cabinet is located on one side of the shell and is used for controlling the work of the first speed reduction motor and the second speed reduction motor. The circuit control cabinet is provided with a display to display a current total amount and accumulated weights of the sand weighed by the automatic weighing machine and the number of times of weighing.

Preferably, an upper port of the falling pipe is provided with a sand baffle plate, and the sand baffle plate is conical.

Preferably, the upper port of the falling pipe passes through the bottom of the upper funnel and extends into the upper funnel by a certain length. A ringlike sand speed reduction chamfering ditch is formed at a joint of the falling pipe and the upper funnel. An included angle between the upper funnel and the wall of the falling pipe extending thereinto is 50+/−1 degrees.

Preferably, one side of the transport belt is made into a rough plane, and the other side of the transport belt is made into an arc-shaped bucket. The arc-shaped bucket drives a certain amount of sand to move towards the upper end of the upper funnel, and the sand falls into the upper funnel from the arc-shaped bucket above the upper funnel.

Preferably, a falling pipe hand grab is mounted on the experiment table supporting frame. The falling pipe hand grab extends into the falling pipe. The falling pipe is fastened on the falling pipe hand grab. The sand collection inverted bucket is welded onto the experiment table supporting frame through a connection rod.

Preferably, a holder frame for mounting the automatic weighing machine is also disposed on the experiment table supporting frame.

Preferably, a vent is formed in the upper side surface of the shell.

Preferably, four groups of the guide rollers are provided and respectively mounted on the left and right sides of the upper end and the left and right sides of the lower end of the transport belt.

Preferably, a transport belt locating slot is formed in the bottom of the shell, and a transport belt locating rod is mounted at the upper part of the shell to prevent the transport belt from falling off.

Preferably, a fixed sleeve and a fastening bolt are disposed on the experiment table supporting frame. The object frame supporting rod of the experiment object frame is fixed in the fixed sleeve on the experiment table supporting frame through the fastening bolt.

Preferably, the side wall of the shell is also provided with a transport belt tightening device.

Preferably, the six object fixing bolts on the sample working frame are uniformly distributed along a fixed surface of the experiment object frame.

Preferably, a travel limiting switch is mounted on the guide rail slot to determine a travel of the horizontal back and forth motion of the automatic weighing machine.

Compared with the prior art, the present disclosure has the beneficial effects that the automatic sand abrasion device in the present disclosure adopts the transport belt and the second speed reduction motor to realize transportation of the sand, and realizes that the weighed sand falls into the bottom of the abrasion device through the first speed reduction motor and the automatic weighing machine; the whole process can be automatically operated while parameters such as the operation time and the weight of abrasion sand are set, so that the detection efficiency for the abrasion resistance can be improved, the labor cost is greatly reduced, and the accuracy and efficiency of the experiment are improved; and furthermore, tiny dust produced in the operation process of the abrasion device can be discharged from the vent by disposing the shell and the vent in the shell, so as to eliminate the influence of the dust on the human health; in the present disclosure, the sand falls off uniformly and an initial downward speed of the sand at the upper port of the falling pipe is allowed to be close to zero as much as possible due to the design of the sand baffle plate and the ringlike sand speed reduction chamfering ditch, thereby improving the accuracy of the experiment; in the mechanism design of the transport belt of the present disclosure, one side is made into the rough plane, and the other side is made into the arc-shaped bucket, thereby improving the sand carrying efficiency; the transport belt locating slot is formed in the bottom of the shell in the present disclosure, and the transport belt locating rod is mounted at the upper part of the shell to prevent the transport belt from falling off; the side wall of the shell is also provided with the transport belt tightening device to prevent that lengthening of the belt due to long-term use affects equipment operation; and these arrangements make the device firm in structure and stable and reliable in work. It can be seen that the present disclosure provides the automatic sand abrasion device which can improve the detection efficiency for the abrasion resistance and greatly reduce the labor cost, is firm in structure and stable and reliable in work and improves the accuracy and efficiency of the experiment.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of an automatic sand abrasion device of the present disclosure;

FIG. 2 is a side view of an automatic sand abrasion device of the present disclosure;

FIG. 3 is a structural schematic diagram of a transport belt of the automatic sand abrasion device;

FIG. 4 is a structural schematic diagram of an arc-shaped bucket of the transport belt of the automatic sand abrasion device;

FIG. 5 is a partially structural schematic diagram of a guide rail slot portion of the transport belt of the automatic sand abrasion device;

FIG. 6 is a structural schematic diagram of a left view of the guide rail slot of the transport belt of the automatic sand abrasion device;

FIG. 7 is a structural schematic diagram of a first embodiment of an upper funnel and falling pipe connection structure of the transport belt of the automatic sand abrasion device; and

FIG. 8 is a structural schematic diagram of a second embodiment of an upper funnel and falling pipe connection structure of the transport belt of the automatic sand abrasion device.

In the drawings: 1: shell; 2: transport belt; 3: upper funnel; 4: falling pipe; 5: sand collection inverted bucket; 6: experiment object frame; 7: automatic weighing machine; 8: guide roller; 9: experimental sand; 10: vent; 11: transport belt tightening device; 12: object fixing bolt; 13: second speed reduction motor; 14: supporting rod; 15: experiment table supporting frame; 16: fastening bolt; 17: fixed sleeve; 18: connection rod; 19: first speed reduction motor; 20: guide rail slot; 21: weighing machine bracket; 22: transport belt locating rod; 23: falling pipe hand grab; 24: bolt; 25: experiment object; 26: circuit control cabinet; 27: PLC (Programmable Logic Controller) display; 28: holder frame; 29: transport belt locating slot; 30: transport belt wheel; 0201: rough plane; 0203: arc-shaped bucket; 2001: rectangular toothed rack frame; 2002: toothed rack; 2003: gear; 2004: travel limiting switch; 0301: ringlike sand speed reduction chamfering ditch; and 0302: sand baffle plate.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Referring to FIGS. 1 to 7, one embodiment provided by the present disclosure is as follows.

An automatic sand abrasion device is characterized by including a shell 1, an integrated framework, a sand falling mechanism, a sand transport mechanism, a sand falling channel, a sample working frame and a circuit control cabinet 26. The integrated framework includes an experiment table supporting frame 15, supporting rods 14 and a weighing machine bracket 21. The weighing machine bracket 21 is fixedly mounted at the bottom in the experiment table supporting frame 15. The supporting rods 14 are fixedly disposed in the experiment table supporting frame 15 to allow the integrated framework to be firmer. In the present embodiment, the supporting rods and the weighing machine bracket are welded inside the experiment table supporting frame. The shell 1 is welded on the experiment table supporting frame 15, and the integrated framework, the sand falling mechanism, the sand transport mechanism, the sand falling channel and the sample working frame are all located in the shell 1. The circuit control cabinet 26 is located outside the shell 1. The sand falling mechanism is used for allowing sand on an automatic weighing machine 7 to fall into the bottom of the automatic sand abrasion device, and includes a guide rail slot 20, the automatic weighing machine 7, a first speed reduction motor 19 and a rectangular toothed rack frame 2001. The guide rail slot 20 is fixed on the weighing machine bracket 21. The rectangular toothed rack frame 2001 is disposed on two sides of the inner side of the guide rail slot 20. A toothed rack 2002 is disposed on the rectangular toothed rack frame 2001. The automatic weighing machine 7 and the rectangular toothed rack frame 2001 are fixedly connected. A gear 2003 of the first speed reduction motor 19 is mounted in the rectangular toothed rack frame 2001 and meshes with the toothed rack 2002 of the rectangular toothed rack frame 2001, so that the gear 2003 of the first speed reduction motor can drive the automatic weighing machine through the rectangular toothed rack frame 2001 to do a horizontal back and forth motion along the guide rail slot. The rectangular toothed rack frame 2001 is mounted inside the guide rail slot 20, and the gear 2003 of the first speed reduction motor 19 is mounted in the rectangular toothed rack frame 2001 and meshes with the toothed rack 2002 of the rectangular toothed rack frame. The size of the designed rectangular toothed rack frame 2001 needs to ensure that the gear 2003 of the first speed reduction motor 19 is not transversely separated from the toothed rack 2002 in an operation process such that the gear 2003 of the first speed reduction motor 19 can drive the automatic weighing machine 7 through the rectangular toothed rack frame 2001 to do a back and forth motion in a horizontal direction along the guide rail slot 20. In the present embodiment, a door is disposed on the experiment table supporting frame 15. The door in the experiment table supporting frame 15 is opened to mount the first speed reduction motor 19 to allow the gear of the first speed reduction motor to perfectly mesh with the toothed rack. The sand transport mechanism includes a second speed reduction motor 13, a transport belt wheel 30, a transport belt 2 and guide rollers 8. The second speed reduction motor 13 is fixed at the exterior top of the experiment table supporting frame 15. The guide rollers 8 are fixed along a moving track of the transport belt 2. An output shaft of the second speed reduction motor 13 is connected with the transport belt wheel 30. The transport belt 2 is disposed on the transport belt wheel 30. The second speed reduction motor 13 drives the transport belt wheel 30 to rotate. The transport belt wheel 30 rotates to drive the transport belt 2 to operate along a rail regulated by the guide rollers 8. The sand falling channel is located at a middle position of a region encircled by the transport belt, and includes an upper funnel 3, a falling pipe 4 and a sand collection inverted bucket 5. The upper end of the falling pipe 4 is provided with the upper funnel 3, and the lower end of the falling pipe 4 is provided with the sand collection inverted bucket 5. The falling pipe 4 and the sand collection inverted bucket 5 are fixedly mounted on the experiment table supporting frame 15. In the present embodiment, the sand collection inverted bucket 5 is welded onto the experiment table supporting frame through a connection rod 18. A door is disposed on the sand collection inverted bucket and can be opened to place an experiment object. The lower end of the sand collection inverted bucket 5 is in contact with the upper surface of the automatic weighing machine 7. The area of the upper surface of the automatic weighing machine 7 is larger than that of an opening at the lower end of the sand collection inverted bucket 5. In the present embodiment, a falling pipe hand grab 23 is mounted on the experiment table supporting frame 15, and the falling pipe 4 is locked by a bolt 24. The sample working frame includes an experiment object frame 6, an object frame supporting rod and object fixing bolts 12. The experiment object frame 6 is located in the sand collection inverted bucket 5. The object frame supporting rod passes through the sand collection inverted bucket 5 to fix the experiment object frame on the experiment table supporting frame 15. The object fixing bolts 12 are used for fixing an experiment object and adjusting the position of the experiment object on the experiment object frame 6. The circuit control cabinet 26 is located on one side of the shell 1 and is used for controlling the work of the first speed reduction motor 19 and the second speed reduction motor 13. The circuit control cabinet 26 is provided with a display to display a current total amount and an accumulated weight of the sand weighed by the automatic weighing machine and the number of times of weighing. The display in the present embodiment is a PLC (Programmable Logic Controller) display 27.

In the present embodiment, an upper port of the falling pipe 4 is welded with a sand baffle plate 0302, and the sand baffle plate 0302 is conical. In order to prevent the inaccuracy of an experiment due to the fact that the transport belt 2 moves to the top end of the falling pipe 4 to make the sand directly flow into the falling pipe 4, the sand baffle plate 0302 is designed to block the sand possibly directly falling into the falling pipe 4 to redirect the sand, so that the sand flows onto the side wall of the funnel and then passes through a ringlike sand speed reduction chamfering ditch 0301 to enable the initial speed to be close to zero as much as possible.

In the present embodiment, the upper port of the falling pipe 4 passes through the bottom of the upper funnel 3 and extends into the upper funnel 3 by a certain length. The ringlike sand speed reduction chamfering ditch 0301 is formed at a joint of the falling pipe 4 and the upper funnel 3. An included angle between the upper funnel 3 and the wall of the falling pipe extending thereinto is 50+/−1 degrees. In the present embodiment, during installation, the upper funnel 3 is mounted at a position, described in FIGS. 6 to 7, on the falling pipe 4 from a lower port of the falling pipe 4. The included angle between the upper funnel 3 and the wall of the falling pipe is 50+/−1 degrees. A certain linear distance is reserved between the corner of the upper funnel 3 and the upper port of the falling pipe 4. In the present embodiment, the ringlike sand speed reduction chamfering ditch 0301 is designed, which consists of the outer wall of the falling pipe and the side wall of the funnel and has an included angle of 50 degrees. The chamfering ditch is filled with the sand falling from the transport belt and has a frictional speed reduction effect on the sand subsequently flowing into the falling pipe 4 in order to ensure that the initial downward speed of the sand at the upper port of the falling pipe is close to zero as much as possible when the sand falls from the belt into the funnel device.

In the present embodiment, one side of the transport belt 2 is made into a rough plane 0201, and the other side of the transport belt 2 is made into an arc-shaped bucket 0203. The arc-shaped bucket 0203 drives a certain amount of sand to move towards the upper end of the upper funnel 3, and the sand falls into the upper funnel 3 from the arc-shaped bucket 0203 above the upper funnel 3. Experimental sand 9 is poured into the bottom of the sand abrasion device to submerge the arc-shaped bucket 0203 at the bottom of the transport belt.

In the present embodiment, a falling pipe hand grab 23 is mounted on the experiment table supporting frame 15. The falling pipe hand grab 23 extends into the falling pipe 4. The falling pipe 4 is fastened on the falling pipe hand grab 23. In the present embodiment, the falling pipe hand grab 23 is mounted on the experiment table supporting frame 15, and the falling pipe 4 is locked by a bolt 24. The sand collection inverted bucket 5 is welded onto the experiment table supporting frame through a connection rod 18.

In the present embodiment, a holder frame 28 for mounting the automatic weighing machine 7 is also disposed on the experiment table supporting frame 15.

In the present embodiment, a vent 10 is formed in the upper side surface of the shell to facilitate dust removal.

In the present embodiment, four groups of the guide rollers 8 are provided, as shown in FIG. 1, and respectively mounted on the left and right sides of the upper end and the left and right sides of the lower end of the transport belt.

In the present embodiment, a transport belt locating slot 29 is formed in the bottom of the shell 1, and a transport belt locating rod 22 is mounted at the upper part of the shell 1 to prevent the transport belt from falling off. The transport belt locating slot 29 is welded to the bottom of the shell 1, and the transport belt locating rod 22 is welded to the upper part of the shell 1.

In the present embodiment, a fixed sleeve 17 and a fastening bolt 16 are disposed on the experiment table supporting frame 15. The object frame supporting rod of the experiment object frame 6 is fixed in the fixed sleeve 17 on the experiment table supporting frame 15 through the fastening bolt 16. In the present embodiment, during installation, the door of the sand collection inverted bucket 5 is opened to mount the experiment object frame 6.

In the present embodiment, the side wall of the shell is also provided with a transport belt tightening device 11 in order to prevent that lengthening of the belt due to long-term use affects equipment operation.

In the present embodiment, six object fixing bolts on the sample working frame are uniformly distributed along the fixed surface of the experiment object frame 6. During installation, the position of the experiment object on the experiment object frame 6 is adjusted through the six object fixing bolts 12 on the experiment object frame 6.

In the present embodiment, a travel limiting switch 2004 is mounted on the guide rail slot 20 to determine a travel of the horizontal back and forth motion of the automatic weighing machine 7.

The present embodiment designs the device of the guide rail slot 20 for pulling back and stretching out of the automatic weighing machine 7, specifically as shown in FIG. 5. 2003 represents the gear connected to the speed reduction motor, and 2002 represents the toothed rack meshing with the gear and arranged on the rectangular toothed rack frame 2001. With clockwise and anticlockwise rotation of an engine, the toothed rack is connected with the automatic weighing machine for pulling back and stretching out. The size of the designed rectangular toothed rack frame 2001 needs to ensure that the gear 2003 of the first speed reduction motor 19 is not transversely separated from the toothed rack 2002 in the operation process such that the gear 2003 of the first speed reduction motor 19 can drive the automatic weighing machine 7 through the rectangular toothed rack frame 2001 to do a back and forth motion in a horizontal direction along the guide rail slot 20.

An installation order of the automatic sand abrasion device is as follows:

the experiment table supporting frame 15 is mounted; the supporting rods 14 and the weighing machine bracket 21 are welded inside the experiment table supporting frame 15; the guide rail slot 20 is mounted on the weighing machine bracket 21 through a nut; the second speed reduction motor 13 and the transport belt wheel 30 are mounted; the falling pipe hand grab 23 is mounted on the experiment table supporting frame 15, and the falling pipe 4 is mounted and then is locked with a bolt 24; the upper port of the falling pipe is welded with the sand baffle plate 0302; the upper funnel 3 is mounted to the position, described as in FIGS. 6 to 7, on the falling pipe 4 from the lower port of the falling pipe 4; the included angle between the upper funnel 3 and the wall of the falling pipe is 50+/−1 degrees; the certain linear distance is reserved between the corner of the upper funnel 3 and the upper port of the falling pipe 4; the sand collection inverted bucket 5 is welded onto the experiment table supporting frame 15 through the connection rod 18; the automatic weighing machine 7 and the rectangular toothed rack frame 2001 are welded together and then are mounted inside the guide rail slot 20; the holder frame 28 for the automatic weighing machine 7 is mounted; the door of the experiment table supporting frame 15 is opened to mount the first speed reduction motor 19 such that the gear 2003 of the speed reduction motor perfectly meshes with the toothed rack 2002; the shell 1 is mounted, which is welded onto the experiment table supporting frame 15; one vent 10 is formed in the upper side surface of the shell to facilitate the dust removal; the circuit control cabinet 26 and the PLC display are mounted; the front door of the shell 1 is opened to mount the four groups of guide rollers 8 at appointed positions in FIG. 1; the transport belt locating slot 29 is mounted, which is welded to the bottom of the shell 1; the transport belt locating rod 22 is mounted, which is welded to the upper part of the shell; the transport belt 2 is mounted; a method for transporting the sand by the transport belt under the driving of the speed reduction motor is to make one side of the belt into the rough plane 0201 and make the other side into the arc-shaped bucket 0203; the transport belt tightening device 11 is mounted on the side wall of the shell; the door of the sand collection inverted bucket 5 is opened to mount the experiment object frame 6, and the front and back positions of the experiment object frame 6 may be adjusted through the fixed sleeve 17 and the fastening bolt 16; the experiment object 25 is mounted, and the position of the experiment object on the sample frame is adjusted through the six object fixing bolts 12 on the experiment object frame 6; and the experimental sand 9 is poured into the bottom of the abrasion device.

A working order of the automatic sand abrasion device of the present embodiment is as follows:

Step I: some sand is placed at the bottom of the abrasion device to submerge the arc-shaped bucket 0203 at the bottom of the belt;

Step II: experiment equipment is started; the transport belt is driven by the second speed reduction motor 13 to clockwise operate along a rail regulated by the guide rollers 8, and the arc-shaped bucket 0203 drives the certain amount of sand to move towards the upper end of the funnel; the sand falling in the moving process returns to the bottom of the device under the action of the gravity; the sand falls into the funnel from the arc-shaped bucket 0203 when reaching a position above the funnel; the sand uniformly passes through the ringlike sand speed reduction chamfering ditch 0301 to flow to the falling pipe 4 via adjustment of the sand baffle plate 0302 of the device;

Step III: the sand freely falls onto the surface of the experiment object through the falling pipe 4, and then intensively falls onto the surface of the automatic weighing machine 7 under the action of the sand collection inverted bucket 5; and

Step IV: the second speed reduction motor 13 and the first speed reduction motor 19 are controlled through a PLC program in the circuit control cabinet to set programs according to the following cycle:

(1) the second speed reduction motor 13 controls the belt to work at a speed of 6 r/m for 4 min;

(2) the second speed reduction motor 13 stops working;

(3) the equipment stops the operation for 30 s to allow the sand on the upper funnel 3, the falling pipe 4, the sand collection inverted bucket 5 and the experiment object to all fall onto the automatic weighing machine 7 within this period of time, and then the automatic weighing machine 7 calculates the weight of the sand thereon at this moment, and the weight is displayed on the PLC display 27;

(4) the PLC display 27 displays the current total amount and the accumulated weight of the sand weighed by the automatic weighing machine and the number of times of weighing;

(5) the travel limiting switch is mounted on the guide rail slot 20 on the weighing machine bracket 21 to determine the travel of the horizontal back and forth motion of the automatic weighing machine 7;

(6) the first speed reduction motor 19 is started to pull the automatic weighing machine 7 to do a horizontal motion towards the weighing machine bracket 21; under the cooperation of the sand collection inverted bucket 5, the sand on the automatic weighing machine 7 all falls into the bottom of the abrasion device in this process; after the automatic weighing machine 7 is pulled to a certain position and the sand on the surface thereof all falls into the bottom of the abrasion device, the first speed reduction motor 19 starts to rotate anticlockwise to re-push the automatic weighing machine 7 back to a position under the sand collection inverted bucket 5, and then stops the operation; and

Step V: the abrasion device starts to automatically operate according to the programs set in Step IV, and stops the operation at set operation time, so no specially-assigned person needs to pay extra attention beside.

The transport belt tightening device 11 is particularly disposed to prevent that the lengthening of the belt due to long-term use affects the equipment operation. Tiny dust produced in the operation process of the abrasion device can be discharged from the vent 10.

Visibly, the application provides an automatic sand abrasion device comprising a shell, an integrated framework, a sand falling mechanism, a sand transport mechanism, a sand falling channel, a sample working frame and a circuit control cabinet. The device adopts the transport belt and the second speed reduction motor to realize transportation of sand, and realizes that the weighed sand falls into the bottom of the abrasion device through the first speed reduction motor and the automatic weighing machine; the whole process can be automatically operated while parameters such as the operation time and the weight of abrasion sand are set, so that the detection efficiency for the abrasion resistance can be improved, the labor cost is greatly reduced; and meanwhile, the device is firm in structure and stable and reliable in work and improves the accuracy and efficiency of an experiment. 

1. An automatic sand abrasion device, comprising: a shell, an integrated framework, a sand falling mechanism, a sand transport mechanism, a sand falling channel, a sample working frame and a circuit control cabinet; wherein the integrated framework comprises an experiment table supporting frame, supporting rods and a weighing machine bracket; the weighing machine bracket is fixedly mounted at a bottom in the experiment table supporting frame; the supporting rods are fixedly disposed in the experiment table supporting frame; wherein the shell is welded on the experiment table supporting frame, and the integrated framework, the sand falling mechanism, the sand transport mechanism, the sand falling channel and the sample working frame are all located in the shell; the circuit control cabinet is located outside the shell; wherein the sand falling mechanism is configured to allow sand on an automatic weighing machine to fall into a bottom of the automatic sand abrasion device, and comprises a guide rail slot, the automatic weighing machine, a first speed reduction motor and a rectangular toothed rack frame; the guide rail slot is fixed on the weighing machine bracket; the rectangular toothed rack frame is disposed on two sides of the inner side of the guide rail slot; a toothed rack is disposed on the rectangular toothed rack frame; the automatic weighing machine and the rectangular toothed rack frame are fixedly connected; a gear of the first speed reduction motor is mounted in the rectangular toothed rack frame and meshes with the toothed rack of the rectangular toothed rack frame, so that the gear of the first speed reduction motor is configured to drive the automatic weighing machine through the rectangular toothed rack frame to do a horizontal back and forth motion along the guide rail slot; wherein the sand transport mechanism comprises a second speed reduction motor, a transport belt wheel, a transport belt and guide rollers; the second speed reduction motor is fixed at the exterior top of the experiment table supporting frame; the guide rollers are fixed along a moving track of the transport belt; an output shaft of the second speed reduction motor is connected with the transport belt wheel; the transport belt is disposed on the transport belt wheel; the second speed reduction motor drives the transport belt wheel to rotate; the transport belt wheel rotates to drive the transport belt to operate along a rail regulated by the guide rollers; experimental sand is poured into the bottom of the sand abrasion device to submerge a bottom of the transport belt; wherein the sand falling channel is located at a middle position of a region encircled by the transport belt, and comprises an upper funnel, a falling pipe and a sand collection inverted bucket; an upper end of the falling pipe is provided with the upper funnel, and a lower end of the falling pipe is provided with the sand collection inverted bucket; the falling pipe and the sand collection inverted bucket are fixedly mounted on the experiment table supporting frame; a door is disposed on the sand collection inverted bucket and can be opened to place an experiment object; a lower end of the sand collection inverted bucket is in contact with an upper surface of the automatic weighing machine; the area of the upper surface of the automatic weighing machine is larger than that of an opening at the lower end of the sand collection inverted bucket; wherein the sample working frame comprises an experiment object frame, an object frame supporting rod and object fixing bolts; the experiment object frame is located in the sand collection inverted bucket; the object frame supporting rod passes through the sand collection inverted bucket to fix the experiment object frame on the experiment table supporting frame; the object fixing bolts are used for fixing the experiment object and adjusting the position of the experiment object on the experiment object frame; and wherein the circuit control cabinet is located on one side of the shell and is configured to control the work of the first speed reduction motor and the second speed reduction motor; and the circuit control cabinet is provided with a display to display a current total amount and an accumulated weight of the sand weighed by the automatic weighing machine and the number of times of weighing.
 2. The automatic sand abrasion device according to claim 1, wherein an upper port of the falling pipe is provided with a sand baffle plate, and the sand baffle plate is conical.
 3. The automatic sand abrasion device according to claim 2, wherein the upper port of the falling pipe passes through a bottom of the upper funnel and extends into the upper funnel by a certain length; a ringlike sand speed reduction chamfering ditch is formed at a joint of the falling pipe and the upper funnel; and an included angle between the upper funnel and a wall of the falling pipe extending thereinto is 50°+/−1°.
 4. The automatic sand abrasion device according to claim 1, wherein one side of the transport belt comprises a rough plane, and the other side of the transport belt is made into an arc-shaped bucket; and the arc-shaped bucket drives an amount of sand to move towards an upper end of the upper funnel, and the amount of sand falls into the upper funnel from the arc-shaped bucket above the upper funnel.
 5. The automatic sand abrasion device according to claim 1, wherein a falling pipe hand grab is mounted on the experiment table supporting frame; the falling pipe hand grab extends into the falling pipe; the falling pipe is fastened on the falling pipe hand grab; and the sand collection inverted bucket is welded onto the experiment table supporting frame through a connection rod.
 6. The automatic sand abrasion device according to claim 1, wherein a holder frame for mounting the automatic weighing machine is disposed on the experiment table supporting frame.
 7. The automatic sand abrasion device according to claim 1, wherein a vent is formed in an upper side surface of the shell.
 8. The automatic sand abrasion device according to claim 1, wherein four groups of the guide rollers are provided and respectively mounted on left and right sides of an upper end and left and right sides of a lower end of the transport belt.
 9. The automatic sand abrasion device according to claim 1, wherein a transport belt locating slot is formed in a bottom of the shell, and a transport belt locating rod is mounted at an upper part of the shell to prevent the transport belt from falling off.
 10. The automatic sand abrasion device according to claim 1, wherein a fixed sleeve and a fastening bolt are disposed on the experiment table supporting frame; and the object frame supporting rod of the experiment object frame is fixed in the fixed sleeve on the experiment table supporting frame through the fastening bolt.
 11. The automatic sand abrasion device according to claim 1, wherein a side wall of the shell is provided with a transport belt tightening device.
 12. The automatic sand abrasion device according to claim 1, wherein six object fixing bolts on the sample working frame are uniformly distributed along a fixed surface of the experiment object frame.
 13. The automatic sand abrasion device according to claim 1, wherein a travel limiting switch is mounted on the guide rail slot to determine a travel of the horizontal back and forth motion of the automatic weighing machine.
 14. The automatic sand abrasion device according to claim 1, wherein the upper port of the falling pipe passes through a bottom of the upper funnel and extends into the upper funnel by a certain length; a ringlike sand speed reduction chamfering ditch is formed at a joint of the falling pipe and the upper funnel; and an included angle between the upper funnel and a wall of the falling pipe extending thereinto is 50°+/−1°. 